Stock stop



May.17, 1938. D, MONTGOMERY ET AL 2,118,014

STOCK STOP Filed Sept. 11, 1955 s Sheets-Sheet 1 l ENTO RS wnald .Mnt may flrlllurliJo If v l 5 ZQTAZATTORNL vs May 17, 1938.

D. H. MONTGbMERY ET AL STOCK STOP Filed Sept. 11, 1955 s Sheets-Sheet 2 INVENTORS Donald HMontgomery ATTORNEYS May 17, 1938. D. H. MONTGOMERY ET AL STOCK STOP Filed Sept. 11, 1935 5 Sheets-Sheet 3 ATTORNEYS May 17, 1938 s'roclr s'ror Donald 11. Montgom ry, Berlin, and Arthur B.

Jobert, Newv Britain Conn, aasignon, by

means assignments, to The New Britain Ma chine Company, New Britain, Coma, a comratlonofconneeticut Alm loatlon September 11, 1985, Serial No. 40..

' Our invention relates to a stock s It is a general oblect of the. invention to provide an improved stock stop.

It is a more specific object to provide a stock stop normally automatically actuated in timed relation with the feed functions of a machine, together with improved means for manually withdrawing the stock stop to permit removal of the butt ends of-stock.

It is another object to provide a stock stop normally automatically actuated and having improved manual means for moving the stock stop to withdrawn position to permit ready removal of butt ends of stock, together with means for automatically moving the stock stop to stock stopping position upon release of the manual means.

It is another object to provide a stock stop which is not likely to collect and become fouled by chips.

Another object is to provide a stock stop which is readily moved to withdrawn position without interference with burrs and the like on the stock end.

Other objects and features of invention will be hereinafter set forth or will become apparent to those skilled in the art.

Briefly stated, in the preferred form of the invention we provide a stock stop member which is normally automatically projected into stock stopping position and at the proper time withdrawn to an out-of-the-way position. The stock stopping member is movable by a rotatable shaft and may be of the swinging type but is preferably a normally enhoused sto'ck stopping memher which is projected from its housing into stock stopping position. when housed the stock stop member is not likely to collect and become fouled with chips. The actuating shaftis normally automatically actuated and we provide improved mechanism for permitting the stock stop toflbe manually withdrawn when it has been automatically projected into stock stopping position,'so that the butt ends of stock may be removed. We prefer to arrange the mechanism so that, upon release of the manually actuated means, the stock stopping member will be resiliently and automatically recoupled to its automatic drive. The stock stop member is preferably moved in such manner as to cause the least interference with burrs or irregular ends on the stock.

In the drawings which show, for illustrative purposes only, a preferred form of the invention- Fig. 1 is a fragmentary view in longitudinal section of a multiple spindle bar machine illustrating features ofour improved stock stop;

Fig. 2 is an enlarged fragmentary sectional view through the right-hand end-of the stop mechanism shown in Fig.1 and taken substantially in the plane of the line 2-2 of Fig. 4;

Fig. 3 is a'sectional view taken substantially in the plane of the line 3-3 of Fig. 2;

Fig. 4 is an enlarged sectional view taken substantially in the plane of the line 4-4 of Fig. 1;

Fig. 5 is an enlarged sectional view taken sub-v stantially in the plane of the line 5-5 of Fig. 1; and i Fig. 6 is an enlarged fragmentary view of a spindle carrier and improved stock stop posi -tioned relatively thereto.

Our invention may be applied to various types of machines but will be disclosed herein as applied to a multiple spindle bar machine of the type disclosed in Gridley et a1. application, Serial No. 551,136, filed July 16, 1931. In the machine of said Gridley et al. application the frame includes a spindle carrier end S and a power case end 6, which are tied together atthe top by means of a tie-plate I. The frame part I carries an indexible spindle carrier 8,-having a plurality of chucks or collets 9 for the bar stock.

' In the particular form shown the tie-plate 1' is provided with a bearing, which slidably re-' ceives and supports a sleeve ll splined therein. as indicated at H. The sleeve at one end carries a stock stop housing I: and a stock stop member or finger II is slidably mounted in said housing, so as to be projectable therefrom into stock stopping positon (dot and dash lines, Figs. 5 and 6) and withdrawn to an out-of-the-way position, as illustrated in full lines in Figs. 5 and 6. The stock stop member I! may be moved by means of a pinion l4, meshing with a rack it formed or secured to the stop member 13. The pinion i4 is carried by a rotatable shaft l6, rotatable in the sleeve II and provided at the right-hand end thereof with a collar 11, rigidly secured to the shaft It so that the latter is held relatively to the sleeve and housing l2 by means of the collar l1 and pinion ll within the housing.

Theshaft I6 is normally rotated mechanically in timed relation with the feed functions of the machine. In the form illustrated the stock stop actuation is primarily by a cam 19 and coacting longitudinally extending slot 21 and a pin 26 secured to the pinion fits in the slot and thus prevents relative rotating movement between the pinion and the sleeve 26. Fitting within the sleeve 26 there is a second sleeve or bushing 26,

V which abuts the end of the pinion 22 and is splined to the shaft l6 by means of a key 66, so that the shaft l6 may be adjusted longitudinally within the sleeve 26. The sleeve 26 is normally non-rotatably coupled to the sleeve 26 and for that purpose the sleeve 26 is provided with a projecting pin 6|, which projects into an axially extending portion 62 of an angular or curved slot 66. Thus, when the pin 6| is in the axial portion 62 of the slot 66 the two sleeves'are held positively against rotation.

A collar 66 is fixedly carried by the sleeve 26 and is secured thereto, as by means of a set screw 65. A coil spring 66 is interposed between the collar 66 and the sleeve 26 and the ends of the coil spring are held in apertures in the sleeve and collar, as will be clear from Fig. 2. The spring 66 is at all times under compression, so as to tend to separate the collar 66 and sleeve 26 axially and is under torsional stress, so as to at all times tend to rotate the collar 66 (and shaft l6 keyed to the sleeve 26) relatively to th sleeve 26.

A split adjusting nut 61 is threaded on the shaft l6 and may be securely held in adjusted.

position by means of a bolt 66 for drawing up on the split nut and causing it to very rigidly grip the shaft l6. The split adjusting nut 61 ispreferably slightly counter-bored to receive and support the end 66 of the sleeve 26 and the left-hand'end of the adjusting nut 61 abuts the web 66 of the tie-plate I. It will be seen that with the shoulder 26 of the pinion in engagement with the wall 25 and the adjusting nut 61 in engagement with the web 66 and the sleeve 26 acting as a spacer between the pinion and adjusting nut, all of the parts including the shaft l6 will be securely held against axial movement. It will also be clear that when the bolt 66 is loosened so as to permit rotation of the adjusting nut 61 on the shaft l6, rotation of the nut 61 will serve to shift the shaft l6 to the desired adjusted position. In the position illustrated in Fig. 1 the shaft i6 is substantially at its limit of left-hand movement and the shaft l6 has segment and cam the shaft l6 will be rotated,

so as to project or withdraw the stock stop member l6.

In the operation of machines of the character indicated the operation of. the stock stop member is so timed that it is in stock stopping position (dot and dash lines, Figs. 5 and 8) when the chuck or collet is in loading position and the chuck opened and the bar stock fed forward. When the bar of stock has about run out and it is no longer feasible to make another piece part from the remaining stock. the butt end must be withdrawn and a new bar of stock inserted in the spindle. Since the stock stop i6 is in normally projected position at the time the collet in loading position is open so that the butt end can be removed, we have devised improved means for withdrawing the stock stop so as to permit ready removal of the butt ends of stock. As illustrated. the sleeve 26 is provided with a circumferentially extending slot 66 for the reception of a pin 66. carried by a manually operable lever 61. The lever 61 is provided with a handle 66 at one endand at the opposite end is pivoted tothe frame in a forked bearing 66 by means of a pivot pin 66. Now, with the cam 26 riding on the highdwell portion 6| of the cam, it will be clear that the -stock stop member l6 will be in projected position and in the way of the removal of the butt end of stock. However, manual swinging of the lever 66, through the medium of the pin 66 and slot 66, will serve to move the sleeve 26 toward the left. The first movement of the sleeve 26- toward the left will free the pin 6| from. the axial or straight portion 62 of theangular slot 66, and further movement of the sleeve will cause the pin 6| on the sleeve 26 to ride up in the angular portion of the slot 66 and cause the sleeve 26 and withv it the shaft l6 to rotate in a clockwise direction as viewed in Fig. 5 and in a counterclockwise direction as viewed in Fig. 4. Such rotation further torsionally stresses the spring 66 and the lefthand movement of the sleeve 26 further compresses the same. The rotation of the shaft 16 through the manual handle serves to withdraw the stock stop member l6 to some withdrawn position, preferably to the dotted line position of Fig. 5, so that the butt end of the stock may be removed. During such removal the operator may simply hold the handle to maintain the stock stop member l6 in withdrawn position. when the butt end of stock has been removed the handle 66 is released and the spring 66 then forces the sleeve 26 toward the right and in doing so rotates the sleeve 26 through the pin and slot connection 62-66 and at the same time the tendency of the spring to uncoil further helps to rotate the sleeve 26 and its splined shaft I 6 to project the stock stop member l6 onto the path of the new bar ofstock to be inserted in the collet in loading position.

It will thus be seen that we have provided a simple means for normally positively locking the stock stop actuating shaft to its automatic mechanical drive and means for very readily rotating the shaft manually relatively to -a part of the mechanical drive, so as to withdraw the stock stop. As soon as the manual means is released the stock stop and its actuating mechanism are resiliently moved to normal mechanical operating position.

The stop member l6 and the housing l2 carrying the same in the preferred form are set at a substantial angle to the vertical (Fig. 6) and the stock stopping surface 55 is preferably slabbed oil in a vertical plane, so that when the stop member is in stock stopping position the stock may abut against the flat surface thereof. When the stop member i6 is withdrawn it will be seen that, due to angular direction of movement of the member l6, there will be a radial movement away from the stock and at the same time an axial movement away from the end of the bar/ so that there is little likelihood of any interference between the stock stop member I 3 and any burr or irregularity which may be on the end of the bar stock. Furthermore, the axial and radial withdrawal of the stock stop avoids the possibility of engagement of the latter by the projecting end of stock during indexing.

It is to be observed that the stop member I3 is projected downwardly and retracted upwardly into the depending housing. The stock stop is therefore in a measure self-cleaning and any chips which might curl up thereon would tend to be stripped off during retraction. With the stock stop extending downwardly chips which might reach the same would tend to fall oil and not lodge thereon. The stop if, when in withdrawn position, is well away from the stock in any of the collets of a multiple spindle machine and there is little likelihood that chips will catch and curl up on the stock stop with consequent danger of feeding short. The stock stop member l3, if it does normally project a short distance as illustrated in Figs. 5 and 6, may be so rounded or in effect stream-lined that -it will be very diillcult for any chips to lodge or curl up thereon.

While the projecting stop member I! as illustrated has many advantages it is to be observed that, since it is actuated by a rotatable shaft, as I, stock stops of other types might readily be employed.

While the invention has been described in considerable detail and a single preferred embodiment shown, it is to be understood that various changes and modifications may be made.

within the scope of the invention as defined in the appended claims.

We claim:

1. In a stock stop, a hor'iing, a stock stop normally housed therein, and means for projecting said stock stop downwardly from said housing into stock stopping position and retracting the same upwardly into said housing.

2. In a stock stop, a dependent housing, a stock stop member normally housed within said housing, and means for projectingsaid stock stop member from said housing downwardly into stock stopping position and retracting the same upwardly into said housing.

3. In a stock stop, a stock stop finger adapted to be positioned in stock stopping position for mechanically arresting the feed of stock, and

means for withdrawing said stock stop finger by a simultaneous axial and radial movement relatively to the end of the stock to be stopped. 4. In a stock stop, a stock stop finger, means for moving the stock stopping portion thereof away from the end of the stopped stock with a simultaneous radial and axial motion relatively to the stock to be stopped.

5. In a stock stop. a stock stop finger, a rotatable shaft for moving said stock stop finger,

actuating means for said shaft, means for re- I Jeasably but positively locking said actuating means and said shaft for joint rotation, and resilient means for holding said shaft and actuating means in positively locked engagement.

8. In a stock'stop, a stock stop member, a

' rotatable shaft for moving the same a'ctuating means for said shaft, means for normally positivcly locking said shaft and actuating means together, and resiliently resisted means for unlocking said actuating means and shaft and rotating said shaft relatively to said actuating means, for the purpose described.

7. In a stock stop, a stock stop member, a rotatable shaft for moving the same, resilient means for moving said stock stop member to stock stopping position, and means for positively withdrawing said member from stock stopping position.

8. In a stock stop, a stock stopping member, a rotatable shaft for moving the same, actuating means for normally actuating said shaft, means for manually moving said shaft independently of said actuating means, and means including a spring for automatically coupling said actuating means and said shaft to each other upon-release of said manual means.

9. In a stock stop, a stock stopping member, a rotatable shaft for moving the same, actuating means for rotating said shaft comprising a gear and pinion, means for. moving said actuatinl means in timed relation with the feed functions of a machine embodying said stock stop, means for manually uncoupling said shaft from driving relationship with said actuating means and moving said shaft and stock stop, and automatic means for coupling said actuating means and'said shaft upon release of said manual means.

10. In a stock stop, a stock stop member, a rotatable shaft for moving the same, actuating means for said shaft including a coupling means, and means for manually moving said coupling means longitudinally of said shaft to rotate said shaft, for the purpose described.

11. In a stock stop, astock stopping member, a rotatable shaft for moving the same, gear means normally non-rotatably coupled to said shaft for rotating the same, means for manually rotating said gear means and shaft relatively to each other for rotating said shaft, and resilient means for rotating said shaft and gear means to normally couple the same in driving relationship.

12. In a stock stop, a stock stop member, a rotatable shaft for moving the same, a drive member for said shaft and normally coupled in driving relationship therewith, andmanual' means for varying the angular position of said drivins member and said shaft while maintaining said driving member stationary for actuating said stock stop member manually.

13. In a stock stop, a stock stop member, a rotatable shaft for moving the same, actuating means for said shaft for projecting said stock stop member into stock stopping position, manual means for withdrawing said stock stop member, and resilient means for projecting said stock stop member upon release of said manual means.

14. In a device of the character indicated for use with a spindle carrying bar stock adapted to be fed therethrough, a reciprocable stock stop movable into position to mechanically stop-a bar of stock fed through the spindle, guide means for reciprocally guiding said stock stop, said guide means being set to reciprocally guide said stock stop in a path at an acute angle to a transverse plane at right angles to the axis of the bar stock. whereby said stock stop will be guided in its reciprocable movement in a direction having a limultaneous axial and radial component relatively to the axis of the bar stock, and means for moving said stock stop into and out of stock stopping position.

DONALD E. MON'IGOMIB. ARTHUR- H. JOBIRT. 

